1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
# -*- coding: utf-8 -*-
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# Author: Mauro Soria
import re
from urllib.parse import unquote
from lib.core.logger import logger
from lib.core.settings import (
REFLECTED_PATH_MARKER,
TEST_PATH_LENGTH,
WILDCARD_TEST_POINT_MARKER,
)
from lib.parse.url import clean_path
from lib.utils.diff import generate_matching_regex, DynamicContentParser
from lib.utils.random import rand_string
class Scanner:
def __init__(self, requester, **kwargs):
self.path = kwargs.get("path", "")
self.tested = kwargs.get("tested", [])
self.context = kwargs.get("context", "all cases")
self.requester = requester
self.response = None
self.wildcard_redirect_regex = None
self.setup()
def setup(self):
"""
Generate wildcard response information containers, this will be
used to compare with other path responses
"""
first_path = self.path.replace(
WILDCARD_TEST_POINT_MARKER,
rand_string(TEST_PATH_LENGTH),
)
first_response = self.requester.request(first_path)
self.response = first_response
duplicate = self.get_duplicate(first_response)
# Another test was performed before and has the same response as this
if duplicate:
self.content_parser = duplicate.content_parser
self.wildcard_redirect_regex = duplicate.wildcard_redirect_regex
logger.debug(f'Skipped the second test for "{self.context}"')
return
second_path = self.path.replace(
WILDCARD_TEST_POINT_MARKER,
rand_string(TEST_PATH_LENGTH, omit=first_path),
)
second_response = self.requester.request(second_path)
if first_response.redirect and second_response.redirect:
self.wildcard_redirect_regex = self.generate_redirect_regex(
clean_path(first_response.redirect),
first_path,
clean_path(second_response.redirect),
second_path,
)
logger.debug(f'Pattern (regex) to detect wildcard redirects for "{self.context}": {self.wildcard_redirect_regex}')
self.content_parser = DynamicContentParser(
first_response.content, second_response.content
)
def get_duplicate(self, response):
for category in self.tested:
for tester in self.tested[category].values():
if response == tester.response:
return tester
return None
def is_wildcard(self, response):
"""Check if response is similar to wildcard response"""
# Compare 2 binary responses (Response.content is empty if the body is binary)
if not self.response.content and not response.content:
return self.response.body == response.body
return self.content_parser.compare_to(response.content)
def check(self, path, response):
"""
Perform analyzing to see if the response is wildcard or not
"""
if self.response.status != response.status:
return True
# Read from line 129 to 138 to understand the workflow of this.
if self.wildcard_redirect_regex and response.redirect:
# - unquote(): Sometimes, some path characters get encoded or decoded in the response redirect
# but it's still a wildcard redirect, so unquote everything to prevent false positives
# - clean_path(): Get rid of queries and DOM in URL because of weird behaviours could happen
# with them, so messy that I give up on finding a way to test them
path = unquote(clean_path(path))
redirect = unquote(clean_path(response.redirect))
regex_to_compare = self.wildcard_redirect_regex.replace(
REFLECTED_PATH_MARKER, re.escape(path)
)
is_wildcard_redirect = re.match(regex_to_compare, redirect, re.IGNORECASE)
# If redirection doesn't match the rule, mark as found
if not is_wildcard_redirect:
logger.debug(f'"{redirect}" doesn\'t match the regular expression "{regex_to_compare}", passing')
return True
if self.is_wildcard(response):
return False
return True
@staticmethod
def generate_redirect_regex(first_loc, first_path, second_loc, second_path):
"""
From 2 redirects of wildcard responses, generate a regexp that matches
every wildcard redirect.
How it works:
1. Replace path in 2 redirect URLs (if it gets reflected in) with a mark
(e.g. /path1 -> /foo/path1 and /path2 -> /foo/path2 will become /foo/[mark] for both)
2. Compare 2 redirects and generate a regex that matches both
(e.g. /foo/[mark]?a=1 and /foo/[mark]?a=2 will have the regex: ^/foo/[mark]?a=(.*)$)
3. Next time if it redirects, replace mark in regex with the path and check if it matches
(e.g. /path3 -> /foo/path3?a=5, the regex becomes ^/foo/path3?a=(.*)$, which matches)
"""
if first_path:
first_loc = unquote(first_loc).replace(first_path, REFLECTED_PATH_MARKER)
if second_path:
second_loc = unquote(second_loc).replace(second_path, REFLECTED_PATH_MARKER)
return generate_matching_regex(first_loc, second_loc)
|
